Alternating current motor and the like



y 5-" E. L. CARLSON 2,001,772

ALTERNATING CURRENT MOTOR AND THE LIKE Filed Deal 19, 1933 UNITED STATESPATENT OFFICE ALTERNATING CURRENT MOTOR AND THE LIKE Elof L. Carlson,Bristol, Conn., minor to The E. Ingraham Company, Bristol, Conn, acorporation Application December 19, 1933, Serial No. 703,031

Claims. (01. 172-275) This invention relates to improvement in elecateach of its respective opposite ends with an tric motors andparticularly to alternating-curoff-setting spring-finger i1, each ofwhich prorent electric motors and other motors operable jects over theadjacent one of the coils 14 so as by a pulsating current supply. I toexert pressure thereon. To guard against the 5 Miniaturealternating-current motors are now possible abrasion of the delicatewiring oi! the 5 extensively s d in loc s and o her instruments. coilsl4, a pad I 8 of rubber, fiber, leather, or and considerable time andexpense have been other suitable material, is interposed between spentin eilorts to minimize these-called aitereach of the said spring-fingers.i 1 and the parnating-current hum, but with more or less inticular oneof the coils H which it overlies.

I in diflerent success. The dampening-plate i5 after its installation 10One of the main objects of the present invenover the projecting rearends of the pillars II tion is to provide reliable and effective meansis clamped tightly in place by nuts I 9, one of for minimizing the humor other noise inthe which is applied to the threaded rear end of eachfieldor stator-structures of electric motors and of the said pillars itafter a washer 20 (preferably is particularly synchronous motors. offiber or the like) has been first installed on Other objects andadvantages will appear to each or the said pillars. those skilled in theart from the following, taken The dampening-plate I5 is also provided onin connection with the accompanying drawing each of its respectiveopposite side edges with a and the appended claims. pair offorwardly-ofisetting fingers 2 i--!2 which In the accompanying drawing:embrace, so to speak, the respective opposite sides, 20

Fig. 1 is a face view of a synchronous electric of the stator-structureand assist in stabilizing the motor embodying one form of the presentinsame against accidental displacement and elecvention; tromagneticvibration.

Fig. 2 is a view thereof in edge elevation; The stator-structure i0 isalso provided with Fig. 3 is a broken detail sectional view taken aplurality of polar-projections 23 projecting on the line 3-3 of Fig. 1but on a larger scale; and inwardly adjacent the periphery of a. rotor24 Fig. 4 is a perspective view of the dampeningin a manner usual inelectric motors, and certain plate detached. of the saidpolar-projections are provided with The synchronous electric motorherein chosen so-called shading or short-circuiting coils for theillustration of the present invention is 25 acting to provide a rotatingmagnetic field for 39 provided with a laminated fieldor statorthe rotor24. Aswill be noted by reference in parstructure generally designated bythe numeral iiicular to Fig. 1, the dampening-plate i5 is II andcomposed of layers ll of iron or other preferably provided with asufliclent number of suitable magnetic material. The saidstatorclearance-openings 26 through which the shadstructure is suitablymounted in the instance ing or short-circuiting coils 25 may project. 35shown upon a gear-box I! by means of four When attached to thestator-structure as (more or less) threaded pillars II which extendshown, the dampening-plate I! or equivalent irom front to rear throughthe seriesof laminamember serves to stabilize the coils ll with tionsforming the mainor body-portion of the respect to the magneticlaminations ii and eflecstator-structure, as clearly indicated in Figs.1 tively prevents such movement between the coil 40 and 2. and the saidlaminations as would occasion an The field-structure shown also includesan appreciable audible hum. In this connection, energizlngorelectromagnet-coil II at each of it may be stated that when the coils Hare enerits respective opposite ends, and through the gized by analternating or other fluctuating ourrespective hollows centers of whichportions of rent, a magnetic reaction takes place between the thestator-structure extend to form magnetic portions of thestator-structure extending cores. through the coils and the coilsthemselves of Placed directly against the rearmost laminasuch nature astends to shift. the said parts with tion II is a dampening-plategenerally designated respect to each other upon each pulsation in the bythe numeral I! and preferably formed of recurrent. Similar magneticreactions will occur silient but non-magnetic material such as brassbetween the individual laminations ii of the and formed with four (moreor less) perforations stator-structur but the sam will be ial llsuitably spaced to respectively fit over the upp ed by e d p -P rearends oi the pillars ll before referred to. The invention may be carriedout in other The dampening-plate II is as shown provided" specific waysthan that herein set forth without emming from the spirit and essentialcharacteristics of the invention, and the present embodiment is,therefore, to he considered in all respects as illustrative and notrestrictive, and all changes coming within the meaning and equivalencyrange of the appended claims are intended to he embraced therein,

I claim:

alternating-current motor, the comhination with the rotor thereof; of astatorstructme having polar-projections extending lateraily toward thesaid rotor, an electromagnetcoil located laterally to one side of thesaid rotor and a magnetic core extending through the said coil; and avibration-dampener of. non-magnetic material and connected to thestator-structure independently of the said core and extending in adirection substantially perpendicular to the axis of the said rotor andconstructed and arranged to engage the exterior of the said coil andpress the latter transversely into engagement with the said core tostabilize the same against relative vibration with respect to each otherand with respect to the said polar-projections, under the influence ofalternating magnetic flux.

2. In an alternating-current motor, the combination with the rotorthereof; of a stator-structure having polar-projections extendinglaterally toward the said rotor, an electromagnet-coil located laterallyto one side of the said rotor and a magnetic core extending through thesaid coil; and a resilient plate-like vibration-dampener oi non-magneticmaterial and connected to the stator-structure independently of the saidcore and extending in a direction substantially perpendicular to theaxis of the said rotor and constructed and arranged to engage theexterior of the said coil and press the latter transversely intoengagement with the said core to stabilize the same against relativevibration with respect to each other and with respect to the saidpolarprojections, under the influence of alternating magnetic flux.

3. In an alternating-current motor, the combination with the rotorthereof; of a stator-structure having two electromagnet-coils located onopposite sides of the said rotor and. a magnetic core extending througheach of the said coils; and a vibration-dampener of non-magneticmaterial extending in a direction substantially perpendicular to theaxis of the said rotor and acting to press both of the saidoppositely-located coils against their respective cores.

4. In an alternating-current motor, the combination with the rotorthereof; of a statorstructure having two eleotromagnet-coils located onopposite sides of the said rotor and a magnetic core extending througheach of the said coils; and a resilient plate-like vihration-dampener ofnon-magnetic material extending in a direction substantiallyperpendicular to the axis of the said rotor and acting to press both ofthe said oppositely-located coils against their respective cores.

5. In an alternatingwurrent motor, the combination with the rotorthereof; of a statorstructure having two electromagnet-coils located onopposite sides of the said rotor and a polemember or magnetic materialfor each of the said coils; and stabilizing-means of non-magneticmaterial extending between the pole-members of the respective coils andpressing against both of said coils to stabilize the same.

ELOF L. CARLSON.

